opt_explain_json_namespace::subquery_ctx Class Reference

Inheritance diagram for opt_explain_json_namespace::subquery_ctx:

List of all members.

Public Member Functions
	subquery_ctx (Explain_context_enum type_arg, const char *name_arg, context *parent_arg)
virtual qep_row *	entry ()
virtual bool	cacheable ()
virtual bool	dependent ()
virtual bool	format (Opt_trace_context *json)
virtual void	set_child (context *child)
virtual size_t	id (bool hide)

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Detailed Description

Node class to wrap a subquery node tree

Implements CTX_WHERE, CTX_HAVING, CTX_ORDER_BY_SQ, CTX_GROUP_BY_SQ and CTX_OPTIMIZED_AWAY_SUBQUERY context nodes. This class hosts underlying join_ctx or uion_ctx.

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Member Function Documentation

virtual bool opt_explain_json_namespace::subquery_ctx::format

(

Opt_trace_context *

json

)

[inline, virtual]

Pass the node with its child nodes to a JSON formatter

Parameters:

json

Formatter

Return values:

false	Ok
true	Error

Note:

The join_ctx class overloads this function.

Reimplemented from opt_explain_json_namespace::context.

virtual size_t opt_explain_json_namespace::subquery_ctx::id

(

bool

hide

)

[inline, virtual]

Analogue of the "id" column in the traditional EXPLAIN output

Parameters:

hide	if true, ban the output of K_SELECT_ID JSON property in the underlying table_with_where_and_derived_ctx objects

Returns:

"Select number" that is associated with this node

Implements opt_explain_json_namespace::context.

virtual void opt_explain_json_namespace::subquery_ctx::set_child

(

context *

child

)

[inline, virtual]

Associate a child node with this node

This function is to be overloaded by subquery_ctx.

Reimplemented from opt_explain_json_namespace::context.

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The documentation for this class was generated from the following file:

• opt_explain_json.cc